s390: remove virt_to_phys implementation

virt_to_phys on s390 currently uses the LRA instruction to translate virtual to physical addresses. This creates an unnecessary overhead and caused trouble with dma debugging code (when called with an address pointing to a already unmapped page). Just get rid of s390's implementation and use the one from asm-generic/io.h . Note: with this change virt_to_phys will no longer work on vmalloc'ed addresses. Reviewed-by: Gerald Schaefer <[email protected]> Signed-off-by: Sebastian Ott <[email protected]> Signed-off-by: Martin Schwidefsky <[email protected]>
arthurschreiber · Jun 26, 2013 · 92820a5 · 92820a5
1 parent b6ed49e
commit 92820a5
Showing 1 changed file with 0 additions and 22 deletions.
diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
@@ -13,28 +13,6 @@
 #include <asm/page.h>
 #include <asm/pci_io.h>
 
-/*
- * Change virtual addresses to physical addresses and vv.
- * These are pretty trivial
- */
-static inline unsigned long virt_to_phys(volatile void * address)
-{
-	unsigned long real_address;
-	asm volatile(
-		 "	lra	%0,0(%1)\n"
-		 "	jz	0f\n"
-		 "	la	%0,0\n"
-		 "0:"
-		 : "=a" (real_address) : "a" (address) : "cc");
-	return real_address;
-}
-#define virt_to_phys virt_to_phys
-
-static inline void * phys_to_virt(unsigned long address)
-{
-	return (void *) address;
-}
-
 void *xlate_dev_mem_ptr(unsigned long phys);
 #define xlate_dev_mem_ptr xlate_dev_mem_ptr
 void unxlate_dev_mem_ptr(unsigned long phys, void *addr);